2A+Solving+Equations

Olivia Billbrough Let's begin.

Cross Multiplication is a way of finding out a missing or simplify a number(s) by using 2 fractions. They are set equal to each other and then you cross multiply.

Example:

because they are similar triangles they can be set equal to each other: 3/5=8/z 3z=40 z=13.3

Sophia Moreno: 14
 * EF-18**



Y = 3X + 15 Y = 3 - 3X

3X + 15 = Y = 3 - 3X 3X + 15 = 3 - 3X 6X + 15 = 3 math \frac{6X}{6} = \frac{-12}{6} math

X = -2

Y = 3X + 15 Y = 3(-2) + 15 Y = -6 + 15 Y = 9

(-2,9)